Best Autonomous AI SDR Platforms for B2B Outbound, Ranked by Pipeline Fit and Cost

Agent Frank is Salesforge's autonomous AI SDR, sold as a fully automated system that finds leads, writes emails, and books meetings, with two operating modes: Autopilot for hands-off execution and Co-pilot for human approval on each message. Pricing is public and volume-based at $499 per month annual or $599 per month quarterly for 1,000 active contacts, which the vendor translates to roughly 2,000–2,500 new leads and 6,000–7,500 personalized emails per month. Sending infrastructure is a separate line item (Infraforge starts at $33 per month for 10 mailboxes, Megaforge at $69 per month for multi-ESP distribution), and independent testing over 90 days on 12,400 sent emails found the 2026 build materially better than the 2024 launch, with copywriting now driven by a research-then-write loop against Claude. The trade-offs: reply categorization independent testers measured at roughly 75% accuracy still needs human triage on ambiguous replies, and native activity tracking is HubSpot-only, with other CRMs supported for lead import but not for outbound activity sync.

Alice is 11x's flagship autonomous SDR digital worker, handling outbound prospecting, personalized multi-channel outreach on email and LinkedIn, and meeting booking. Its companion phone agent, Julian, qualifies inbound leads across phone, chat, and SMS. 11x published a Growth plan starting at $36,000 per year in 2026, with Pro and Enterprise tiers custom-quoted based on contact volume. Vendr's marketplace data reports median contract values around $40,125 per year and a typical range of $38,250 to $65,550, and multi-worker enterprise deployments scale beyond that. Independent testing on a 50-contact enterprise cohort reported a 5.7% reply rate and the highest personalization score in the cohort, with the platform integrating deeply enough with Salesforce that it natively picks up opportunity stage, deal history, account ownership, and territory assignments. The trade-offs are documented in independent reviews: implementation runs 2–6 weeks including procurement, autonomy requires sustained CRM hygiene to avoid off-brand output, and the ~$1,500/seat/month economics rule out anyone under about 50 seats.

Ava is Artisan's autonomous AI BDR, sold as an 'AI employee' that handles lead sourcing from a 300M+ contact database, AI-written multi-step email sequences, LinkedIn touchpoints, and a per-seat power dialer, with signal detection via Data Miner and Watchtower for funding, hiring, and website-visitor events. Pricing is credit-based with a free tier granting a 10,000-credit trial (~$300 in value), plus paid tiers at $280 (Intern) and $660 (Employee) per month, with Enterprise custom-quoted. Third-party procurement estimates place the effective full-motion Accelerate plan at roughly $2,000/month for approximately 12,000 leads per year, and higher volumes at $5,000+/month. Independent reviewers consistently praise the onboarding UX, the bundled 300M-contact database, and the deliverability suite (warmup, mailbox health scoring, spam avoidance), and consistently flag that AI-written emails at scale read as templated without heavy prompt tuning.

AiSDR is a quarterly-billed AI SDR platform aimed at small and mid-market outbound teams, with an Explore plan at $900/month for 1,200 AI messages and 1,200 lead search credits, a Grow plan at $2,500/month for 4,500 messages, and custom Enterprise tiers, with a 20% discount on annual billing. Every plan includes unlimited seats, personas, and campaigns, which is a genuine differentiator in a category where seats and personas are typically gated by tier. The platform ships email and LinkedIn outreach in one flow, with a phone dialer via Aircall integration. Independent testing places its cost per booked meeting in the $40–$180 mid-tier band, and platform documentation shows LinkedIn safeguards that cap activity under daily limits, exclude wrong companies and regions, and swap a step to email when an account risks running hot. The trade-off: message volumes are metered (credits, not features, are what runs out) and there is no free trial, so the first quarter is a $2,700 commitment before ramp.

Regie.ai's RegieOne is an AI-native sales engagement platform that combines Auto-Pilot Prospecting Agents with an AI parallel dialer, an AI content engine, and a native 220M+ contact database, orchestrating both AI agents and human reps in a single workflow. Published pricing starts at $180 per user per month on the AI SEP tier with a 10-seat minimum ($21,600/year effective floor) and $499 per user per month on the Force Multiplier Rep tier with a 5-seat minimum, with RegieOne custom-quoted. The company reported 300% year-over-year ARR growth at its $30M Series B in February 2025. The platform positions itself as reps and AI agents working in one workflow rather than a full SDR replacement: Auto-Pilot agents source and enrich contacts and run continuous engagement while reps handle top-tier outreach and calls fed by the agent. The trade-offs are the seat-minimum floors, per-user pricing that scales expensively past a small team, and independent user reports that AI-generated content occasionally reads as robotic without tuning.